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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Net Sales:          
Total net sales $ 186,903 $ 165,289 $ 349,519 $ 328,114  
Operating Income (Loss)          
Total operating income (loss) 13,626 7,415 22,132 10,541  
Total income before income taxes 12,345 5,947 19,299 8,197  
Interest Expense, net:          
Interest expense, net 1,840 1,658 3,354 2,936  
Capital Expenditures:          
Capital expenditures     12,006 15,229  
Total Assets:          
Total assets 419,199   419,199   $ 364,252
Continuing Operations [Member]          
Net Sales:          
Total net sales 186,903 165,289 349,519 328,114  
Depreciation and Amortization:          
Total depreciation and amortization [1] 5,870 5,788 11,139 11,906  
Interest Expense, net:          
Interest expense, net 1,840 1,658 3,354 2,936  
Capital Expenditures:          
Capital expenditures 5,189 6,740 12,006 15,229  
Total Assets:          
Total assets 419,199   419,199   364,252
Operating Segments [Member] | Continuing Operations [Member]          
Operating Income (Loss)          
Total operating income (loss) 13,626 7,415 22,132 10,541  
Intersegment Eliminations [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales (8,669) (6,762) (16,229) (12,416)  
Total Assets:          
Total assets (250,540)   (250,540)   (249,789)
Electronics [Member]          
Net Sales:          
Total net sales 65,945 64,014 125,608 125,412  
Electronics [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 57,761 57,895 110,397 114,327  
Operating Income (Loss)          
Total operating income (loss) 4,495 3,222 8,315 6,646  
Depreciation and Amortization:          
Total depreciation and amortization 1,040 955 2,080 1,911  
Interest Expense, net:          
Interest expense, net 124 41 163 86  
Capital Expenditures:          
Capital expenditures 854 1,084 3,985 3,022  
Total Assets:          
Total assets 113,253   113,253   97,443
Electronics [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 8,184 6,119 15,211 11,085  
Control Devices [Member]          
Net Sales:          
Total net sales 109,374 85,041 202,275 165,600  
Control Devices [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 108,889 84,398 201,257 164,269  
Operating Income (Loss)          
Total operating income (loss) 18,297 11,984 31,814 21,590  
Depreciation and Amortization:          
Total depreciation and amortization 2,475 2,326 4,784 4,786  
Interest Expense, net:          
Interest expense, net 55 81 116 165  
Capital Expenditures:          
Capital expenditures 3,304 3,847 6,031 7,882  
Total Assets:          
Total assets 158,061   158,061   127,649
Control Devices [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 485 643 1,018 1,331  
Corporate [Member] | Continuing Operations [Member]          
Interest Expense, net:          
Interest expense, net 659 733 1,323 1,461  
Capital Expenditures:          
Capital expenditures 9   114 913  
Total Assets:          
Total assets [2] 284,554   284,554   288,806
Corporate [Member] | Continuing Operations [Member] | Scenario, Adjustment [Member]          
Capital Expenditures:          
Capital expenditures   (230)      
Corporate [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Operating Income (Loss)          
Total operating income (loss) [3] (8,075) (5,200) (13,789) (12,454)  
Depreciation and Amortization:          
Total depreciation and amortization 124 55 194 70  
PST [Member]          
Net Sales:          
Total net sales 20,253 22,996 37,865 49,518  
PST [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 20,253 22,996 37,865 49,518  
Operating Income (Loss)          
Total operating income (loss) (1,091) (2,591) (4,208) (5,241)  
Depreciation and Amortization:          
Total depreciation and amortization 2,231 2,452 4,081 5,139  
Interest Expense, net:          
Interest expense, net 1,002 803 1,752 1,224  
Capital Expenditures:          
Capital expenditures 1,022 2,039 1,876 3,412  
Total Assets:          
Total assets 113,871   113,871   $ 100,143
PST [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales  
[1] These amounts represent depreciation and amortization on property, plant and equipment and certain intangible assets.
[2] Assets located at Corporate consist primarily of cash, intercompany loan receivables, equity investments and investments in subsidiaries.
[3] Unallocated Corporate expenses include, among other items, finance, legal, human resources and information technology costs as well as share-based compensation.